1248661500221 has 4 divisors (see below), whose sum is σ = 1248665467200. Its totient is φ = 1248657533244.

The previous prime is 1248661500217. The next prime is 1248661500227. The reversal of 1248661500221 is 1220051668421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1248661500221 - 2² = 1248661500217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1248661500227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1466411 + ... + 2155848.

It is an arithmetic number, because the mean of its divisors is an integer number (312166366800).

Almost surely, 2^{1248661500221} is an apocalyptic number.

It is an amenable number.

1248661500221 is a deficient number, since it is larger than the sum of its proper divisors (3966979).

1248661500221 is an equidigital number, since it uses as much as digits as its factorization.

1248661500221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3966978.

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 1248661500221 in words is "one trillion, two hundred forty-eight billion, six hundred sixty-one million, five hundred thousand, two hundred twenty-one".